NativeTimer.java

/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.xnio.nativeimpl;

import java.util.concurrent.atomic.AtomicBoolean;

import org.xnio.XnioExecutor;

/**
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
final class NativeTimer extends NativeDescriptor implements XnioExecutor.Key {
    private final Runnable task;
    private final boolean oneShot;
    // todo if this works use something better than this
    private final AtomicBoolean canRun = new AtomicBoolean(true);

    NativeTimer(final NativeWorkerThread thread, final int fd, final Runnable task, final boolean oneShot) {
        super(thread, fd);
        this.task = task;
        this.oneShot = oneShot;
    }

    public boolean remove() {
        if (canRun.getAndSet(false)) {
            unregister();
            Native.close(fd, null);
            return true;
        } else {
            return false;
        }
    }

    protected void handleReadReady() {
        if (oneShot) {
            if (canRun.getAndSet(false)) {
                unregister();
                Native.close(fd, null);
            }
        } else if (! canRun.get()) {
            return;
        }
        try {
            Native.readTimer(fd, null);
            task.run();
        } catch (Throwable ignored) {
        }
    }

    protected void handleWriteReady() {
        throw new IllegalStateException();
    }
}